UNVENTED (VENT-FREE) UNIVERSAL FIREBOX
OWNER’S OPERATION AND INSTALLATION MANUAL
MODELS
UVC-ST
36" See-Thru Heat-
Circulating Firebox
UV-ST 36'' See-Thru Non-
Circulating Firebox
UVC-ST SHOWN
For more information, visit www.fmiproducts.com
WARNING: If the information in this manual is not
followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable
vapors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re
department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
P F S
®
US
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55473B2
WARNING: Improper installation, adjustment, al-
teration, service or maintenance can cause injury or
property damage. Refer to this manual for correct in-
stallation and operational procedures. For assistance
or additional information consult a qualied installer,
service agency or the gas supplier.
WARNING: For use only with decorative type un-
vented room heaters. Do not build a wood re.
This rebox has been tested and approved by I.A.S.
under their REQ. 2-97 for use with any ANS Z21.11.2
approved gas logs.
SAFETY
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, op-
erate or service this rebox.
Improper use of this rebox can
cause serious injury or death
from burns, re, explosion, elec-
trical shock or carbon monoxide
poisoning.
CAUTION: Carefully review
the instructions supplied with
the decorative type unvented
room heater for the minimum
rebox size requirement. Do not
install the appliance in this re-
box unless this rebox meets the
minimum dimensions required
for the installation.
WARNING: Any change to
this rebox or its controls can
be dangerous.
TABLE OF CONTENTS
Safety .................................................................. 2
Local Codes......................................................... 4
Unpacking............................................................ 4
Product Features ................................................. 4
Product Specications ......................................... 5
Locating Firebox ................................................. 5
Air for combustion and Ventilation ....................... 6
Installation ........................................................... 8
Operating Guidelines and Maintenance
Instructions ..................................................... 16
Replacement Parts ............................................ 16
Technical Service............................................... 17
Accessory .......................................................... 17
Parts .................................................................. 18
Warranty ..............................................Back Cover
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55473B 3
WARNING: Do not use a blow-
er insert, heat exchanger insert
or other accessory not approved
for use with this rebox.
Do not allow fans to blow directly
into the rebox. Avoid any drafts
that alter burner ame patterns.
Ceiling fans can create drafts
that alter burner ame patterns.
Altered burner patterns can
cause sooting.
Firebox front and screen be-
comes very hot when running
rebox. Keep children and adults
away from hot surfaces to avoid
burns or clothing ignition. Fire-
box will remain hot for a time
after shutdown. Allow surfaces
to cool before touching.
Carefully supervise young chil-
dren when they are in the room
with rebox.
You must operate this replace
with the provided fireplace
screen, hood and brick liner in
place. Make sure these parts
are in place and screens are
closed before running rebox.
The supplied hoods may not be
replaced with hoods which may
be provided with a log heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other am-
mable vapors and liquids.
SAFETY
Continued
1. This rebox shall not be installed in a
bedroom or bathroom.
2. Never install the rebox
• in a recreational vehicle
• where curtains, furniture, clothing or
other ammable objects are less than
42" from the front, top or sides of the
rebox
• in high trafc areas
• in windy or drafty areas
3. Do not use this rebox as a wood-burning
replace. Use only decorative unvented
room heaters (log sets).
4. Do not add extra logs or ornaments such as
pine cones, vermiculite or rock wool. Using
these added items can cause sooting.
5. Use only the provided hoods accessories.
See Accessories on page 17.
6. Vent-free gas log heaters installed in this
rebox require fresh air ventilation to run
properly. See Air for Combustion and
Ventilation, page 6.
7. Do not run rebox
• where ammable liquids or vapors are
used or stored
• under dusty conditions
8. Do not use this rebox to cook food or
burn paper or other objects.
9. Never place any objects in rebox or on
logs.
10. Turn rebox off and let cool before servic-
ing. Only a qualied service person should
service and repair rebox.
11. Operating vent-free logs in a rebox above
elevations of 4,500 feet could cause pilot
outage.
12. Do not use the rebox if it has been un-
der water due to the shock hazard that
could result with the blower accessary (if
installed) in place.
13. Provide adequate clearances around air
openings.
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55473B4
LOCAL CODES
1. Remove all protective packaging from
inside rebox. Carefully lift the rebox off
the bottom corrugated tray.
2. Carton should contain 2 deective hoods
and hardware packet in addition to rebox
assembly. If items are missing, inform
dealer where you bought rebox.
3. Check rebox for any shipping damage. If
rebox is damaged call FMI PRODUCTS,
LLC at 1-866-328-4537 for replacement
parts before returning to dealer.
Install and use rebox with care. Follow all
local codes. In the absence of local codes,
use the latest edition of The National Fuel Gas
Code ANS Z223.1/NFPA 54*. Firebox must
be electrically grounded in accordance with
the National Electrical Code, ANS/NFPA70
(latest edition).
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
State of Massachusetts: The installation
must be made by a licensed plumber or
gas tter in the Commonwealth of Mas-
sachusetts.
Sellers of unvented propane or natural
gas-red supplemental room heaters shall
provide to each purchaser a copy of 527
CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for
bedroom and bathroom installation in the
Commonwealth of Massachusetts.
UNPACKING
NOTICE: The rebox identica-
tion label (including model num-
ber, serial number, clearances,
etc.) is located underneath the
heat shield. See Figure 19, page
16.
PRODUCT FEATURES
OPERATION
This rebox is designed for use with approved
ANS Z21.11.2 decorative type unvented room
heaters. (Physical size limitations apply. Refer
to minimum rebox requirements supplied
with log heater.) It requires no outside vent-
ing or chimney making installation easy and
inexpensive. When used without the blower,
the rebox requires no electricity making it
ideal for emergency backup heat.
BLOWER ACCESSORY
The UVC-ST only firebox will accept the
GA3750A accessory. The variable blower
allows you to select the fan speed you de-
sire. The blower circulates heated air from
the rebox into the room. Use of blower is
optional.
BRICK LINER
This rebox features a concrete brick liner. As
with all concrete liners, this liner may develop
slight cracks when exposed to heat. These
cracks will not affect the performance of the
rebox or vent-free gas logs.
HEAT DEFLECTIVE HOOD
Two (2) black painted steel hoods come
standard with the unit, which must be installed
for a safe operation.
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55473B 5
PRODUCT SPECIFICATIONS
Figure 1 - Dual-Sided Firebox
4
1
/
4
"
3
1
/
8
"
5
12"
4"
1
1
/
4
"
1/2"
5/8"
20
1
/
2
"
5
1
/
2
"
11
1
/
2
"
2
1
/
4
"
40"
17
1
/
2
"
37
1
/
2
"
1
1
/
2
"
3"
24"
36
1
/
2
"
42
1
/
2
"
Figure 2 - Projected Installation
LOCATING FIREBOX
PLANNING
Plan where you will install the rebox. This will
save time and money later when you install
the rebox. Before installation, consider the
following:
1. Where the rebox will be located. Allow for
wall and ceiling clearances (see Installa-
tion Clearances, page 9).
2.
Everything needed to complete installation.
3. This model CANNOT be installed in a
bedroom or bathroom.
4. Proper air for combustion and ventilation.
5. Consider a location where heat output
would not be affected by drafts, air condi-
tion ducts, windows or doors.
6. A location that minimizes modications
on existing framing will make installation
easier.
Projected installations can extend any
distance into the room. A projection may
be ideal as a partition between two oth-
erwise common areas when added to an
existing, nished wall (see Figure 2).
Internal wall installation provides a
discreet viewing option between two
adjacent rooms or within an added wall
to subdivide an oversize room.
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55473B6
AIR FOR COMBUSTION AND VENTILATION
WARNING: This heater shall
not be installed in a room or
space unless the required vol-
ume of indoor combustion air
is provided by the method de-
scribed in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, the
International Fuel Gas Code, or
applicable local codes. Read the
following instructions to insure
proper fresh air for this and
other fuel-burning appliances
in your home.
Today’s homes are built more energy efcient
than ever. New materials, increased insulation
and new construction methods help reduce
heat loss in homes. Home owners weather
strip and caulk around windows and doors
to keep the cold air out and the warm air in.
During heating months, home owners want
their homes as airtight as possible.
While it is good to make your home energy
efcient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
Exhaust fans, reboxes, clothes dryers and fuel
burning appliances draw air from the house to
operate. You must provide adequate fresh air
for these appliances. This will insure proper
venting of vented fuel-burning appliances.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National
Fuel Gas Code ANS Z223.1/NFPA 54,Air for
Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 6 through 8 will help
you classify your space and provide adequate
ventilation.
Unusually Tight Construction
The air that leaks around doors and windows
may provide enough fresh air for combustion
and ventilation. However, in buildings of un-
usually tight construction, you must provide
additional fresh air.
Unusually tight construction is dened as
construction where:
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of one
perm (6 x 10
-11
kg per pa-sec-m
2
) or less
with openings gasketed or sealed and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to
areas such as joints around window
and door frames, between sole plates
and oors, between wall-ceiling joints,
between wall panels, at penetrations
for plumbing, electrical and gas lines
and at other openings.
If your home meets all of the three criteria
above, you must provide additional fresh
air. See Ventilation Air From Outdoors,
page 8.
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow for Firebox Location,
page 7.
Conned and Unconned Space
The National Fuel Gas Code ANS Z223.1/
NFPA 54 denes a conned space as a space
whose volume is less than 50 cubic feet per
1,000 Btu/hr (4.8 m
3
per kw) of the aggregate
input rating of all appliances installed in that
space and an unconned space as a space
whose volume is not less than 50 cubic feet
per 1,000 Btu/hr (4.8 m
3
per kw) of the ag-
gregate input rating of all appliances installed
in that space. Rooms communicating directly
with the space in which the appliances are
installed*, through openings not furnished
with doors, are considered a part of the un-
conned space.
This heater shall not be installed in a conned
space or unusually tight construction unless
provisions are provided for adequate combus-
tion and ventilation air.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation
grills between them.
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55473B 7
DETERMINING FRESH-AIR FLOW
FOR FIREBOX LOCATION
Determining if You Have a Conned or
Unconned Space
Use this work sheet to determine if you have
a conned or unconned space.
Space: Includes the room in which you will
install heater plus any adjoining rooms with
doorless passageways or ventilation grills
between the rooms.
1. Determine the volume of the space (length
x width x height).
Length x Width x Height =__________cu. ft.
(volume of space)
Example: Space size 22 ft. (length) x 18 ft.
(width) x 8 ft. (ceiling height) = 3168 cu. ft.
(volume of space)
If additional ventilation to adjoining room
is supplied with grills or openings, add the
volume of these rooms to the total volume
of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can sup-
port.
________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 3168 cu. ft. (volume of space) x 20
= 63,360 (maximum Btu/Hr the space can
support)
3. Add the Btu/Hr of all fuel burning appliances
in the space.
Gas water heater* __________ Btu/Hr
Gas furnace __________ Btu/Hr
Vented gas heater __________ Btu/Hr
Gas replace logs __________ Btu/Hr
Other gas appliances* + _________ Btu/Hr
Total = _________ Btu/Hr
* Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
Example:
Gas water heater __________ Btu/Hr
Gas rebox logs + _________ Btu/Hr
Total = _________ Btu/Hr
AIR FOR COMBUSTION AND VENTILATION
Continued
40,000
39,000
79,000
4. Compare the maximum Btu/Hr the space
can support with the actual amount of Btu/
Hr used.
_______ Btu/Hr (maximum the space can
support)
_______ Btu/Hr (actual amount of Btu/Hr
used)
Example: 63,360 Btu/Hr (maximum the
space can support)
79,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the above example is a conned
space because the actual Btu/Hr used is more
than the maximum Btu/Hr the space can sup-
port. You must provide additional fresh air.
Your options are as follows:
A. Rework work sheet, adding the space
of an adjoining room. If the extra space
provides an unconned space, remove
door to adjoining room or add ventilation
grills between rooms. See Ventilation Air
from Inside Building, page 8.
B. Vent room directly to the outdoors. See
Ventilation Air from Outdoors, page 8.
C. Install a lower Btu/Hr gas log heater, if
lower Btu/Hr size makes room uncon-
ned.
If the actual Btu/Hr used is less than the
maximum Btu/Hr the space can support, the
space is an unconned space. You will need
no additional fresh air ventilation.
WARNING: If the area in which
the heater may be operated does
not meet the required volume for
indoor combustion air, combus-
tion and ventilation air shall be
provided by one of the methods
described in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54,
the International Fuel Gas Code,
or applicable local codes.
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55473B8
AIR FOR COMBUSTION AND VENTILATION
Continued
Figure 3 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
2
Ventilation
Grills Into
Adjoining
Room,
Option 1
Figure 4 - Ventilation Air from Outdoors
Outlet
Air
V e ntilated
Attic
Outlet
Air
Inlet
Air
Inlet Air
V e ntilated
Crawl Space
T o
Crawl
Space
T o Attic
INSTALLATION
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining
unconned space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" of the
ceiling and one within 12" of the oor on the
wall connecting the two spaces (see option
1, Figure 3). You can also remove door into
adjoining room (see option 2, Figure 3). Fol-
low the National Fuel Gas Code ANS Z223.1/
NFPA 54 Air for Combustion and Ventilation
for required size of ventilation grills or ducts.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
and one within 12" of the oor. Connect these
items directly to the outdoors or spaces open
to the outdoors. These spaces include at-
tics and crawl spaces. Follow the National
Fuel Gas Code ANS Z223.1/NFPA 54 Air for
Combustion and Ventilation for required size
of ventilation grills or ducts.
IMPORTANT: Do not provide openings for
inlet or outlet air into attic if attic has a thermo-
stat-controlled power vent. Heated air entering
the attic will activate the power vent.
NOTICE: This rebox in com-
bination with unvented log
sets are intended for use as
supplemental heat. Use along
with your primary heating
system. Do not install them as
your primary heat source. If you
have a central heating system,
you may run system’s circulat-
ing blower while using heater.
This will help circulate the heat
throughout the house. In the
event of a power outage, you
can use unvented logs as your
primary heat source.
WARNING: A qualied ser-
vice person must install rebox.
Follow all local codes.
WARNING: Never install the
rebox
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing or other ammable
objects are less than 42" from
the front, top or sides of the
rebox
• in high trafc areas
• in windy or drafty areas
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55473B 9
CAUTION: Log heaters in-
stalled in this rebox create warm
air currents. These currents move
heat to wall surfaces next to re-
box. Installing rebox next to vinyl
or cloth wall coverings or operat-
ing rebox where impurities (such
as, but not limited to, tobacco
smoke, aromatic candles, clean-
ing uids, oil or kerosene lamps,
etc.) in the air exist, may discolor
walls or cause odors.
IMPORTANT: Vent-free gas log heaters add
moisture to the air. Although this is benecial,
installing rebox in rooms without enough
ventilation air may cause mildew to form from
too much moisture. See Air for Combustion
and Ventilation, page 6.
IMPORTANT: Make sure the rebox is level.
If rebox is not level, log set will not work
properly.
Note: Your rebox is designed to be used in
zero clearance installations. Wall or framing
material can be placed against any exte-
rior surface on the rear, sides or top of your
rebox, except where standoff spacers are
integrally attached. If standoff spacers are
attached to your rebox, these spacers can
be placed directly against wall or framing
materials.
Use dimensions shown for rough openings
to create the easiest installation (see Built-In
Firebox Installation, page 9).
INSTALLATION CLEARANCES
WARNING: Maintain the
minimum clearances. If you can,
provide greater clearances from
oor, ceiling and adjoining wall.
Carefully follow the instructions below. This
will ensure safe installation.
Minimum Wall and Ceiling Clearances
A. Clearances from side of rebox opening
to any combustible wall should not be less
than 8".
B. Clearances from top of rebox opening to
the ceiling should not be less than 42".
INSTALLATION
Continued
C. When rebox is installed on carpeting
or other combustible material, other
than wood ooring, the rebox should
be installed on a metal or wood panel
extending the full width and depth of the
enclosure.
D. Clearances from bottom of rebox to the
oor is 0".
CAUTION: Do not install
the rebox directly on carpet
or vinyl.
CAUTION: Use only the clear-
ances specied in this manual or
on the rebox rating plate.
Minimum clearances to combustibles are:
• Sides of outer casing 0" min.
• Drywall to sides and top of 0" min.
front face
• Ceiling to opening 42' min.
• Floor (see Minimum Wall 0" min.
and Ceiling Clearances, note C)
• Perpendicular walls 4' min.
Right and Left
• Distance to Facing Walls 36" min.
See Figures 5 and 6.
Figure 5 - Minimum Clearance Front View
42" Min.
0" to Wood
Floor
4" Min.
0" Min. Clearance to
Upper Frame/Wallboard
Ceiling
4" Min. from the Perpendicular
Side Wall to the Edge of Facial
1/2" Min. Clearance
to Combustibles
44
1
/
4
"
22
3
/
4
"
24"
Figure 6 - Minimum Clearance - Top View
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55473B10
INSTALLATION
Continued
Mantel Clearances for Built-In
Installation
If placing custom mantel above built-in re-
box, you must meet the minimum allowable
clearance between mantel shelf and top of
rebox opening shown in Figure 7. These are
the minimum allowable mantel clearances
for a safe installation. Use larger clearances
wherever possible to minimize the heating of
objects and materials placed on the mantel.
CAUTION: Do not allow the
vent-free gas log heater to touch
or extend beyond the rebox
screen.
If your installation does not meet the above
minimum clearances in Figure 7, you must:
• raise the mantel to an acceptable height,
OR
• remove the mantel.
BUILT-IN FIREBOX INSTALLATION
Built-in installation of this rebox involves
installing rebox into a framed-in enclosure.
This makes the front of rebox ush with
wall. Optional perimeter brass trim acces-
sories are available (see Accessories, page
17). The brass trim will extend past sides of
rebox approximately 1/2". This will cover the
rough edges of the wall opening. If installing
a mantel above the rebox, you must follow
the clearances shown in Figure 7. Follow the
instructions below to install the rebox in this
manner.
1. Frame in rough opening. The firebox
framing should be constructed of 2 x 4
lumber or heavier. Construct framing
using dimensions shown in Figure 8 and
9, page 11. It is recommended that the
framing be constructed rst and the unit
be placed in position by removing the
nailing anges from one side. After sliding
the unit into place, the outer most anges
may be replaced and nailed to the framing
on all sides before applying the wallboard
to the exterior framing.
2. If the vent-free rebox is to be installed
directly on carpeting, tile (other than ce-
ramic) or any combustible material other
than wood ooring; the vent-free rebox
must be installed upon a metal or wood
panel extending the full width and depth
of the vent-free rebox.
3. If a raised platform is to be constructed,
ceiling clearances must be maintained.
Figure 7 - Minimum Mantel Clearances
for Built-In Installation
Supplied
Firebox
Hoods Must
Be Used
at All Ti mes
Wire-mesh
Screen
Firebox T o p
Mantel Shelf
3"
6"
9
1
/
4
"
Combustible
Material
1
1
/
2
" Max
Thickness
Note: All vertical
measurements are from
top of fireplace hood to
bottom of mantel shelf.
These minimum
clearances replace any
other recommended
clearances supplied
with your ANS Z21.1 1 .2
approved gas logs.
Wall board or facing material (above firebox)
may be of combustible material, including
decorative mantel ornaments or other similar
projections off of the facing material.
Top Frame
(Combustible
Material)
12"
15"
18"
Note: Do not
cover louver
openings.
6" Min.
44
1
/
4
" Min.
40
1
/
4
" Min.
36" Min. to
Facing Wall
22
3
/
4
"
Min.
Facing
Wall
Wallboard
Wallboard
Gas Line
Facing Wall
(Base line)
Note: Gas line
may also be on
opposite side.
Figure 8 - Framing for Built-In Firebox
Installation
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55473B 11
INSTALLATION
Continued
1
1
/
2
" Max.
3/8" Max.
4"
8" Min. from adjacent
wall to fireplace opening
SAFE
ZONE
Combustible material must
not overlap more than 3/8"
onto black metal front face.
Nailing Flange
Drywall
Figure 9 - Framing for Built-In Firebox
Installation, Top View
Minimum from
rebox edge to
combustible material
Edge
of side
rebox
opening
4. Install gas piping to rebox location. See
Installing Gas Line and Connecting to Gas
Supply in log set owner’s manual.
IMPORTANT: If installing blower accessory.
See Hard-Wiring Firebox, page 13.
5. Carefully set rebox in front of rough open-
ing. IMPORTANT: If installing brass trim
kit, see instructions included with brass
trim accessory. You must install shoulder
screws from brass trim kit now.
6.
Carefully insert rebox into rough opening.
7. Attach rebox to wall studs using nails
or wood screws through holes in nailing
ange (see Figure 10).
8. If using optional brass trim kit, install the
trim after nal nishing and/or painting of
wall. See instructions included with brass
trim accessory for attaching brass trim.
IMPORTANT: When nishing your rebox,
combustible materials such as wall board,
gypsum board, sheet rock, drywall, plywood,
etc. may be butted up next to the sides and top
of the rebox. Combustible materials should
never overlap the rebox front facing.
WARNING: Do not allow any
combustible materials to over-
lap the rebox front facing (see
Figure 9).
IMPORTANT: Noncombustible materials such
as brick, tile, etc. may overlap the front facing,
but should never cover any necessary open-
ings like louvered slots.
WARNING: Never modify or
cover the louvered slots on the
front of the rebox.
WARNING: Use only non-
combustible mortar or adhe-
sives when overlapping the front
facing with noncombustible
facing material.
Figure 10 - Attaching Firebox to Wall Studs
Nailing Flanges
Nails or
Wood
Screws
INSTALLING GAS LINE
WARNING: A qualied ser-
vice person must connect heater
to gas supply. Follow all local
codes.
IMPORTANT: See Connecting to Gas Supply
in your log set owner’s manual for details on
gas hookup.
You may run the gas line from either side of
the rebox (see Figure 11, page 12). When
you have determined how the gas line will run,
locate one of the recessed knockouts in the
rebrick oor (see Figure 12, page 12). Firmly
tap the center of the knockout with a chisel
until it is released. Carefully chisel the rough
edges of the hole you have made to smooth
edges. This hole will line up with the hole in
the metal oor.
www.fmiproducts.com
55473B12
INSTALLATION
Continued
CAUTION: Do not use exces-
sive force to remove the knock-
out. Too much force may damage
the rebrick concrete insert.
A manual shutoff valve, complying with the
National Fuel Gas code, ANS Z223.1/NFPA
54, must be included within 6' of the vent-
free rebox gas supply system. It may be
convenient to install the gas shutoff outside
the vent-free rebox enclosure where it can
be accessed with a key through a wall as
shown in Figure 13. Depending on the type
of installation, some local codes may require
you to install 2 manual shutoff valves inde-
pendently accessible from both rooms. Check
your local codes for applicable installation
requirements.
A 36" long 1/2" NPT SCHD 40 exible gas
connector line complying with the National
Fuel Gas code ANS Z223.1/NFPA 54, may
be run from the regulator to the incoming 1/2"
NPT black iron gas line. You may also route
the incoming 1/2" NPT black iron gas line
directly to the appliance regulator.
The incoming gas line may be routed into the
vent-free rebox either from the left or right
Figure 12 - Location of Knockouts for
Gas Line
Extension
Key
Shut-Off Valve
Figure 13 - Typical Exterior Wall Gas
Shut Off Installation
Knockouts
3/4" Thick Liner
Remove This Area
Firebrick Floor
Figure 14 - Sediment Trap Installation
Incoming
1/2" Gas Line
Permitted by
Local Codes
Sediment Trap
(Not Supplied)
Figure 11 - Installing Gas Line and
Manual Shutoff Valve
Manual Shutoff
Valve is Located
Under Firebox Floor
on Either Side
Gas Line Installed Through Access
Hole on One Side of Firebox
Alternative Gas
Line Location
hand sides (see Figure 11). Remove the gas
line cover plate from the vent-free rebox’s
outer surround at the location to be used.
If a sediment trap is not incorporated as a part
of the gas utilization equipment, one shall be
installed as close to the inlet of the equipment
as practical at the time of installation, as per
ANS Z223.1/NFPA 54. See Figure 14.
www.fmiproducts.com
55473B 13
Prepare incoming black iron gas line with
Teon tape or pipe joint compound (check with
local codes as to the use of Teon tape). Com-
pounds used on threaded joints of gas piping
shall be resistant to the action of propane/LP
and should be applied lightly to ensure excess
sealant does not enter the gas line.
Complete your gas installation by connecting
the incoming gas line to the appliance regula-
tor. Secure all joints tightly with wrench but do
not overtighten. If a exible gas line is used,
take care not to kink the connector.
WARNING: All gas piping
and connections must be tested
for leaks after the installation is
completed. After ensuring that
the manual shutoff gas valve is
open, apply a soap and water
solution to all connections and
joints. If bubbles appear, leaks
can be detected and corrected.
DO NOT USE OPEN FLAME FOR
LEAK TESTING AND DO NOT
OPERATE ANY APPLIANCE IF
A LEAK IS DETECTED.
INSTALLATION
Continued
GAS SUPPLY TESTING
Note: This section is intended as a guide for
qualied technicians installing gas to this
vent-free rebox.
CAUTION: Do not connect
vent-free heater before pressure
testing gas piping. Damage to
gas valve may result and an un-
safe condition may be caused.
The appliance and its’ individual shutoff valve
must be disconnected from the gas supply
piping system during any pressure testing of
that system at test pressures in excess of 1/2
psig (3.5 kPa).
The appliance must be isolated from the gas
supply piping system by closing manual shut-
off valve during any pressure testing of the gas
supply piping system at test pressures equal
to or less than 1/2 psig (3.5 kPa).
HARD-WIRING FIREBOX
Model UVC-ST only can be hard-wired to the
duplex outlet located inside the rebox bottom
if desired. This allows the blower accessory to
be plugged into the duplex outlet.
NOTICE: A qualied electrician
must connect electrical wiring to
duplex outlet for built-in instal-
lation. Follow all local codes. In
absence of local codes follow
The National Electric Code ANS/
NFPA 70.
ELECTRICAL INSTALLATION
A model blower system assembly is avail-
able for use with the UVC-ST only vent-free
rebox as an optional accessory. This blower
is designed to be installed on either side of
the UVC-ST only rebox, when provisions
for a 120 VAC supply connection are made
at either end of the cabinet. Use of a blower
system other than those manufactured by FMI
PRODUCTS, LLC voids the warranty.
Electrical connections are made within the
receptacle with wires that are routed through
the bushing provided (see Figure 15). The
receptacle may be relocated to either side,
when necessary. However, the cover plate
must be replaced over the unused access
point. Be certain to properly ground the vent-
free rebox using the green grounding wire
(see Figure 17 on page 14).
Figure 15 - Locating Electrical
Connection and Gas Connection on
Either Side of Fireplace
Cover
Plates
Electrical
Connection
Access Hole
Gas Connection
Access Hole
www.fmiproducts.com
55473B14
Note: A 120V supply connection to the leads
to the receptacle must be provided for use
with the optional blower kit whether installed
during or after initial rebox installation. You
may not be able to install a supply connection
after the nal installation is completed. Refer
to Optional Blower Assembly Installation for
specics.
OPTIONAL BLOWER ASSEMBLY
INSTALLATION
Proper installation of the blower system is re-
quired to insure that the maximum discharge
of air can be delivered through the louvers on
each side of the replace.
Note: You may perform this installation from
either side of the replace within either room.
The lower door panels are removable from
both sides of the rebox for better access.
1. Remove blower assembly from packaging
and inspect fan and wiring for damage. If
any wiring is loose or damaged, return
assembly for exchange to your dealer or
distributor.
2. Remove bottom louver by pulling both
spring latches (located in each end of
louver) toward center of appliance at the
same time until disengaged from locating
holes in rebox (see Figure 16).
3. Locate 2 strips of hook and loop mounting
strips on one side of base of lower com-
partment. Align mounting strips on blower
with mounting strips on base of rebox.
4. Install blower housing with exhaust outlet
ports directed upwards along inner side
wall of lower compartment. The blower
outlets must be installed ush to the outer
INSTALLATION
Continued
cabinet for air to ow properly.
5. Apply gentle force between hook and loop
mounting strips to seat blower.
6. Remove control knob and lock nut from
blower speed control shaft.
7. Place speed control shaft through 3/8"
hole provided in right side of lower door
panel removed in step 2.
8. While supporting speed control housing,
secure shaft in panel hole with lock nut.
Place control knob on shaft.
9. Plug blower power cord into receptacle
located in lower rebox compartment.
Check to make sure there are no foreign
objects in blower wheel.
WARNING: Never touch blow-
er wheel while in operation.
10. Turn blower on and check for proper
operation.
11. Turn blower off before continuing.
12. Replace lower door panel by inserting tabs
on bottom of panel into locating slots on
rebox. Push door panel into an upright
position and secure with screws removed
in step 2.
Figure 16 - Removing Bottom Louver
Locating
Holes
Spring Latch
Bottom Louver
www.fmiproducts.com
55473B 15
Figure 17 - Optional Blower Wiring Diagram
INSTALLATION
Continued
HEAT DEFLECTIVE HOOD
INSTALLATION
The factory supplied heat deective hoods
must be installed inside the replace opening
on both sides for the safe operation of the unit
as shown in Figure 18.
1. Re move protect ive covering from
hoods.
2. Position deflective hood into opening
on one side of the rebox and secure
to the top of the opening using screws
provided.
3. Secure the ends of the hood to the rebox
using two screws (provided) for each
side.
4. Repeat steps 2 and 3 to install hood on
the opposite side of the rebox.
CAUTION: Do not clean hood
with abrasive cleanser. Use only
regular household cleaners and
a smooth cloth.
Figure 18 - Typical Hood Installation
(Both Sides)
2 Screws Each
End of Hood
Corner
Post
Front Hood
(Typical Each Side)
3 Screws
(Top)
INCOMING
120V AC
(FUSE BOX
OR
BREAKER)
BLK
BLK
GRN
GRN
WHT WHT
FIELD WIRE
GND
CONNECTORS
(NOT SUPPLIED)
VA RIABLE
SPEED
CONTROL
BLOWER
RECEPTACLE
ELECTRICAL RATING:
120v, 60Hz, 0.9A
Note: If any of the original wire must be replaced, it must be
replaced with type TEW minimum 16GA copper wire rated at 105°C
www.fmiproducts.com
55473B16
OPERATING GUIDELINES AND MAINTENANCE
INSTRUCTIONS
REPLACEMENT PARTS
Figure 19 - Location of Firebox
Identication Label
Air Deector
Identication
Label
Brick Liner
Heat Shield
When lit for the rst time, a vent-free log
heater will emit a slight odor for about an hour
or two. This is a normal occurrence which is
due to the “curing” of the logs and the “burn-in”
of internal paints and lubricants used in the
manufacturing process.
Keep control compartments, logs, burners
and areas surrounding the logs clean by
vacuuming or brushing at least twice a year.
Temporary removal of the log set may ease
the cleaning of the burner and pilot assembly.
In cleaning, take care not to alter the settings
on the pilot assembly. See the operating
instructions supplied with your vent-free log
heater for additional cleaning instructions.
WARNING: Logs can be very
hot! Allow logs to cool before
handling.
IMPORTANT: Turn off the gas supply at the
external shutoff valve before servicing appli-
ance. Any safety screen or guard removed for
servicing must be replaced prior to operating
the appliance.
Installation and repair should be done by a
qualied person. The appliance should be
inspected before use and at least annually by
a professional service person. More frequent
cleaning may be required due to excessive lint
from carpeting, pet hair, etc. It is imperative
that the control compartments, burners and
circulating air passageways of the appliance
be kept clean.
WARNING: Children and
adults should be alerted to the
hazards of high surface tempera-
tures and to stay away to avoid
burns or clothing ignition. Young
children should be carefully
supervised when they are in the
same room as the appliance.
For lighting and operating this vent-free
rebox, please refer to the vent-free gas logs
manufacturer’s instruction manual.
Note: Use only original replacement parts.
This will protect your warranty coverage for
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call FMI PRODUCTS, LLC at
1-866-328-4537.
When calling FMI PRODUCTS, LLC, have
ready:
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• purchase date
Usually, we will ask you to return the part to
the factory.
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call FMI PRODUCTS, LLC at
1-866-328-4537 for referral information. A
list of authorized dealers can be found by
visiting www.fmiproducts.com.
When calling FMI PRODUCTS, LLC, have
ready:
• model and serial numbers of your heater
• the replacement part number
Note: The rebox identication label (including
model number, serial number, clearances,
etc.) is located underneath the heat shield.
See Figure 19.
www.fmiproducts.com
55473B 17
GA3750A
An optional blower is available for use with
the UVC-ST only firebox.
TECHNICAL SERVICE
You may have further questions about installation, operation, or troubleshooting. If so, contact
FMI PRODUCTS, LLC at 1-866-328-4537. When calling please have your model and serial
numbers of your heater ready.
You can also visit FMI PRODUCTS, LLC’s web site at www.fmiproducts.com.
ACCESSORY
Purchase these accessories from your local dealer. If they can not supply these accessories
call FMI PRODUCTS, LLC at 1-866-328-4537 for information. You can also write to the ad-
dress listed on the back page of this manual.
www.fmiproducts.com
55473B18
PARTS
MODELS UVC-ST AND UV-ST
**These items are used on both sides of fireplace.
8**
14
16**
16**
16**
7-1
7-2
2
16**
11**
12
6
6
6
15
15
15
15
13
18
5**
15
15
15
15
6
6
15
1
5
4
15
15
15
15
15
15
15
15
15
4
10**
16**
16**
8**
16**
17**
16**
7-1
9**
15
1
3
www.fmiproducts.com
55473B 19
PARTS
MODELS UVC-ST AND UV-ST
This list contains replaceable parts used in your rebox. When ordering parts, follow the
instructions listed under Replacement Parts on page 16 of this manual.
KEY
NO. PART NO. DESCRIPTION QTY.
1 *** Firebox Assembly • • 1
2 *** Firebox Bottom
• • 1
3 *** Firebox Top
• • 1
4 23982 Top Spacer
• • 4
5 26731 Deector Hood
• • 2
6 26740 Nailing Flange
• • 8
7-1 02013 Side Refractory Brick Liner
• • 2
7-2 02014 Bottom Refractory Brick Liner
• • 2
8 24007 Side Refractory Retainer
• • 4
9 12125 Screen
• • 4
10 26578 Top Louver
• 2
11 26614 Bottom Louver
• 2
12 14418 Receptacle 15A DVP.
• 1
14420 Handy Box 1-7/8 Deep
• 1
14421 Cover Duplex receptacle
• 1
11183 Screw 6/32 x 3/8 PPH
• 1
13 21171 Access Hole Cover
• • 6
14 099230-01 Shoulder Screws 14
15 11164 Screw, #10 x 1/2, zinc PH
• • 24
16 11165 Screw, #10 x 5/8, zinc PH
• • 46
17 23469SA Spacer Front/Back Drywall
• • 2
18 14123 Strain Relief
• 1
PARTS AVAILABLE - NOT SHOWN
*** Not a eld replaceable part.
UVC-ST
UV-ST
55473
Rev. B
04/10
WARRANTY
KEEP THIS WARRANTY
FMI PRODUCTS, LLC LIMITED WARRANTIES
New Products
Standard Warranty: FMI PRODUCTS, LLC warrants this new product and any parts thereof to be free from defects
in material and workmanship for a period of one (1) year from the date of rst purchase from an authorized dealer
provided the product has been installed, maintained and operated in accordance with FMI PRODUCTS, LLC’s
warnings and instructions.
For products purchased for commercial, industrial or rental usage, this warranty is limited to 90 days from the date
of rst purchase.
Factory Reconditioned Products
Limited Warranty: FMI PRODUCTS, LLC warrants factory reconditioned products and any parts thereof to be
free from defects in material and workmanship for 30 days from the date of rst purchase from an authorized dealer
provided the product has been installed, maintained and operated in accordance with FMI PRODUCTS, LLC’s
warnings and instructions.
Terms Common to All Warranties
The following terms apply to all of the above warranties:
Always specify model number and serial number when contacting the manufacturer. To make a claim under this
warranty the bill of sale or other proof of purchase must be presented.
This warranty is extended only to the original retail purchaser when purchased from an authorized dealer, and only
when installed by a qualied installer in accordance with all local codes and instructions furnished with this product.
This warranty covers the cost of part(s) required to restore this product to proper operating condition and an allow-
ance for labor when provided by a FMI PRODUCTS, LLC Authorized Service Center or a provider approved by
FMI PRODUCTS, LLC. Warranty parts must be obtained through authorized dealers of this product and/or FMI
PRODUCTS, LLC who will provide original factory replacement parts. Failure to use original factory replacement
parts voids this warranty.
Travel, handling, transportation, diagnostic, material, labor and incidental costs associated with warranty repairs,
unless expressly covered by this warranty, are not reimbursable under this warranty and are the responsibility of
the owner.
Excluded from this warranty are products or parts that fail or become damaged due to misuse, accidents, improper
installation, lack of proper maintenance, tampering, or alteration(s).
This is FMI PRODUCTS, LLC’s exclusive warranty, and to the full extent allowed by law; this express warranty ex-
cludes any and all other warranties, express or implied, written or verbal and limits the duration of any and all implied
warranties, including warranties of merchantability and tness for a particular purpose to one (1) year on new products
and 30 days on factory reconditioned products from the date of rst purchase. FMI PRODUCTS, LLC makes no
other warranties regarding this product.
FMI PRODUCTS, LLC’s liability is limited to the purchase price of the product, and FMI PRODUCTS, LLC shall not
be liable for any other damages whatsoever under any circumstances including indirect, incidental, or consequential
damages.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental
or consequential damages, so the above limitation or exclusion may not apply to you.
This warranty gives you specic legal rights, and you may also have other rights which vary from state to state.
For information about this warranty contact:
Model (
located on product or identication tag
) _____________________________
Serial No. (
located on product or identication tag
) __________________________
Date Purchased __________________________
Keep receipt for warranty verication.
2701 S. Harbor Blvd.
Santa Ana, CA 92704
1-866-328-4537
www.fmiproducts.com
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